因为男人没有. 酱紫... Google 下什么是第一性征, 什么是第二性征.
-madog(▓▒░武疯子░▒▓);
2015-3-6(#9301415@0)
刚google道的,严格来说不是“性器官”, 是“性信号器官”:If men have sex on the brain, they are not alone. Recent research found that women’s sensory cortex has three distinct areas corresponding to stimulation of the clitoris, vagina, and cervix (1)
-ellesmeer(明天是晴天);
2015-3-6{161}(#9301491@0)
To their surprise, researchers found that self stimulation of the nipples lights up the same areas. This sheds further light on the sexual importance of breasts.